T-Mobile breaking promises to seniors who were offered price-lock guarantee for life on 55+ rate plans

In 2017, I also signed up for a 55+ rate plan with the assurance that my monthly rate was price-locked for life. This incentive was a primary reason that I switched to T-Mobile.  In June, T-Mobile raised my monthly rate by $10.00.  When I spoke to their customer service people this morning, they told me that there was nothing that they could do to fix the problem.  They said a mass-text message was sent to me but I never recall seeing any notification. My bad for not checking my bill sooner to even notice the issue. Crazy for a company to out and out LIE about their pricing practices. I know they have experienced cost increases, but so has everyone and they never should have promised to maintain no-increase pricing in the first place. This reminds me of George HW Bush's "no new taxes" promise which he didn't keep.  T Mobile probably (and correctly) figured they would not lose many customers since they did retain pricing for 7 years or so, and customers won't want to go through the hassle of changing carriers - since there still are not many lesser-cost options available.